Written by Foam Laundry | Salt Lake City's laundry pickup and delivery service.
You should wash your fitted sheet and flat sheet every one to two weeks. Pillowcases need it more often: every three to four days if you have oily skin, allergies, or a pet that shares the bed.
That is the short answer. But bedding is not one thing. A pillowcase in direct contact with your face every night is very different from a duvet cover, and washing everything on the same schedule means either washing some items too rarely or wearing out others too fast. This guide breaks it down by item.
Quick-Reference: How Often to Wash Each Bedding Item
| Bedding Item | Average Adult | Allergy or Pet Owner | Notes |
|---|---|---|---|
| Pillowcases | Every 3-4 days | Every 2-3 days | Most skin-contact item on your bed |
| Fitted sheet | Every 1-2 weeks | Every 5-7 days | Collects the most sweat and dead skin |
| Flat sheet | Every 1-2 weeks | Every 5-7 days | Wash with the fitted sheet to stay consistent |
| Duvet cover | Every 2-3 weeks | Every 1-2 weeks | Less skin contact, but still needs regular washing |
| Pillow insert | Every 3-6 months | Every 6-8 weeks | Often ignored; can harbor dust mites and mold spores |
| Mattress protector | Every 1-2 months | Every 3-4 weeks | Protects your mattress investment; easy to forget |
| Weighted blanket | Every 2-4 weeks | Every 1-2 weeks | Check care label; many are spot-clean only on the outer shell |
Why Sheets Get Dirty Faster Than You Think
The average person loses about 30,000 to 40,000 dead skin cells per hour. A full night of sleep means millions of skin cells in your sheets by morning. Add sweat. Most adults sweat between a half pint and a full pint per night, and that creates a warm, damp environment that dust mites thrive in.
Dust mites do not bite. They eat dead skin cells, and their waste is one of the most common indoor allergens. A mattress that has never been protected can host hundreds of thousands of dust mites. Your sheets are the first line of defense.
Pet dander, body oils, and any lotions or hair products you use before bed all transfer to your pillowcases within the first night. This is why pillowcases need washing more often than the rest of your bedding. They are doing the most work.
Salt Lake City Makes This Worse
If you live in Salt Lake City, a few things accelerate how quickly your bedding gets dirty.
Inversion season. From November through February, the Salt Lake Valley traps cold air under a warm layer, creating some of the worst air quality in the country. Particulate matter and fine dust settle on everything in your home, including your bedding. If you open windows or have any air exchange, inversion air brings those particles directly to your sheets.
High desert dust. Salt Lake sits at the edge of the Great Basin desert. The valley is dry most of the year, and dry air means more airborne dust and skin-cell shedding. Humidity usually sits below 20 percent in summer. Low humidity pulls more moisture from your skin at night, which means more dry skin cells in your sheets.
Outdoor lifestyle. A lot of SLC residents hike, ski, bike, or run before coming home. Trail dust, sunscreen, and outdoor allergens like cottonwood pollen in spring follow you to bed if you do not shower first. If you have a dog that comes on hikes, your bed sees all of that.
Washing your sheets every week rather than every two weeks makes a real difference if any of these apply to you.
What Happens If You Go Too Long
The consequences of infrequent washing are gradual, which is why it is easy to ignore them.
After two to three weeks without washing, dust mite populations in your sheets can double. If you wake up stuffy, congested, or with itchy eyes, and you do not have a cold, your bedding might be the cause. Most people blame seasonal allergies when the real trigger is sleeping on a mite-populated surface every night.
Beyond allergens, oils and sweat cause yellowing in white and light-colored sheets over time. This is permanent if the sheets are also dried on high heat before being cleaned. Heat sets the stain into the fibers.
Pillowcases that go too long without washing also transfer oils and bacteria back to your skin, which contributes to breakouts along the jaw and cheek, the areas that press against the pillow during sleep.
How to Wash Sheets So They Last
Getting sheets clean is not complicated. Getting sheets clean without shortening their lifespan is slightly more nuanced.
Use cold or warm water, not hot. Hot water sanitizes, but it also weakens fibers over time and causes shrinkage in cotton sheets. Warm water (around 90 to 105 degrees Fahrenheit) handles the bacteria and sweat without the damage.
Gentle or normal cycle. Sheets do not need a heavy-duty cycle. A normal or gentle cycle is enough for weekly washing. Save the heavy-duty setting for visibly soiled items.
Skip the fabric softener. Fabric softener leaves a coating on sheet fibers that reduces their breathability over time. It also reduces the absorbency of cotton, which is the opposite of what you want in a sheet. A small amount of white vinegar in the rinse cycle does a better job of softening without the buildup.
Low heat or air dry. High heat is the fastest way to shrink sheets and wear out elastic in fitted sheet corners. Dry on medium or low heat, and remove sheets while still slightly damp to finish air drying. This also reduces wrinkles significantly.
Wash sheets separately. Sheets wrap around other items in a mixed load, which prevents both from cleaning properly. Sheets washed alone get better water circulation and come out cleaner.
What About Comforters, Duvets, and Weighted Blankets?
This is where most people fall behind, and it is not about laziness. These items simply do not fit a standard apartment washing machine.
A king duvet insert or a thick comforter needs a large-capacity washer. Most residential machines, especially the stackable units common in SLC apartment buildings, max out around 12 to 14 pounds of capacity. A king comforter can weigh 8 to 12 pounds dry, and wet it becomes unbalanced enough to trigger the machine's imbalance shutoff mid-cycle.
The result: people skip washing their comforter for months or years because it is genuinely inconvenient.
Duvet covers (the removable shell over a duvet insert) should be washed every two to three weeks. They take most of the skin contact so the insert stays cleaner longer. The insert itself needs washing every three to six months, or more often if you have allergies or if the cover slips off frequently.
If you do not have access to a large-capacity machine, a laundromat with commercial-grade machines handles oversized bedding. Or, if you use a laundry pickup and delivery service, oversized bedding is typically included without the logistical headache.
At Foam, we handle full bedding sets, including king duvets and oversized comforters, as part of regular pickups for Salt Lake City residents. It is one of the most common reasons people sign up: they want their heavy bedding washed regularly without having to find a laundromat with a large enough machine.
Ready to stop thinking about laundry day?
Foam picks up your laundry in Salt Lake City, washes everything including bedding and oversized items, folds it, and delivers it back to your door, usually the same day. Plans start at $24.99 per week, and new customers get 50% off the first week.
Frequently Asked Questions
How often should you wash bed sheets?
Wash your sheets every one to two weeks. Pillowcases need more frequent washing: every three to four days, because they have direct contact with your face and hair all night. If you have allergies, asthma, or a pet in the bed, move to weekly washing for everything.
Can you wash sheets too often?
You can shorten the lifespan of sheets by washing them on high heat or with harsh detergents too frequently, but washing on a normal or gentle cycle with cold or warm water every week will not damage quality sheets. The main risk is heat, not frequency.
How do you wash sheets to make them last longer?
Use cold or warm water on a normal or gentle cycle, skip fabric softener, and dry on low heat or air dry. Wash sheets separately from other laundry so they can circulate freely and clean properly. Remove them from the dryer while slightly damp to reduce wrinkling and fiber stress.
How often should you wash a duvet or comforter?
Wash your duvet cover every two to three weeks and the insert every three to six months. Comforters follow the same timeline. If you use a duvet cover consistently and it gets washed regularly, the insert stays cleaner longer. Pillow inserts should be washed every three to six months.
Foam Laundry provides laundry pickup and delivery in Salt Lake City, Utah. Plans start at $24.99 per week with same-day turnaround and free pickup and delivery.